kahan



(No Model.)

2 Sheets-Sheet 1.

S. KAHAN & A. W. CRAVEN.

ELEGTRIG ALARM CLOCK.

.No. 398,896. Patented Mar. 6, 1889.,

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2 Sheets-Sheet 2.

(No Model.)

s. KAHAN & A. W. CRAVEN.

ELEGTRIG ALARM CLOCK.

N0. 398,896. Patented Mar. 5, 1889 UNITE STATES PATENT OFFICE.)

SAMUEL KAHAN AND ALBERT VILLIAH CRAX'EX, OF MELBOURNE, VICTORIA.

ELECTRIC ALARM=CLOCK.

SPECIFICATION forming part of Letters Patent No. 398,896, dated March 5, 1889.

Application filed October 13,1888- Scrial No. 287,983. (No motleld To aZZ whom it may concern; l our invention may be arranged to be worked Beitknown thatwe, SAMUEL KAHAN, watch 3 on a close circuit by causing the contactmaker, and ALBERT VILLIAM CRAVEN, civil 5 piece on the rock-shaft to break an electrical engineer, subjects of the Queen of Great Britcircuit, so as to operate a relay which will 5 5 5 ain, residing, respectively, at Clerkenwell thus complete the bell-circuit. e provide House, Burwood Road, Hawthorn, near Melthe clock with a suitable switch, whereby it bourne, in the British Colony of Victoria, and may be cut out of the electrical circuit in orat 123 Collins Street, Vest Melbourne, aforeder to render the alarm inoperative. said, have invented new and useful Improve- Having now generally described and ascer- 60 to ments in Electrical Alarm-Clocks, of which tained the nature of our invention and in the following is a specification. what manner the same is to be performed, we This invention of improvements in elecwill proceed to describe the same more partrieal alarm-clocks has been designed for the j ticularly with the aid of the accompanying purpose of obviating certain objectionable idrawings, in which 7 65 features which have been incidental to elec- Figure 1 is a rear elevation of the works of trical alarm-clocks as heretofore constructed. an electrical alarm-clock embodying our in- Themeans hitherto employed for utilizing the vention. Fig. 2 is a plan. Fig. 3 is a front movement of certain parts of a clock for comelevation with part of the face of the clock pleting an electrical circuit through a bell 1 broken away; and Fig. t is a side elevation of 70 have usually consisted of some form of conthe same.

tact-piece arranged to be shifted around the A represents the ratchet-wheel, which is sedial of the clock and to make contact with cured upon the arbor (t of one of the quickthe hour-hand at certain times, according to moving wheels of the clock, and B is the balits position on the dial. \Ye have found in anced pawl, which is pivoted between two practice, however, that by reason of the slow arms, Z Z), projecting from the rock-shaft (Y. movement of the hour-hand the contact bel whose outer end carries a contact-piece, l'), tween it and the contact-piece continued for arranged to complete an electrical circuit a longer period than was desirable, thus eausthrough a bell by contacting with the insuing either a very appreeiablewaste of the eleclated spring I). The contact-piece l) is held 80 o trical energy of the batteryor else necessiiatnormally out of engagement by a spring.

ing the breaking of the bell-eircuit by means as shown in Fig. 'l.

of aswitch or thclikea practice that is open 0 represents the coil-spring, which always to many obvious objections. tends to hold pawl I; out of engagement with By our invention we are enabled to limit ratchet-wheel A by keeping the rock-shaft S- a the duration of time during which the elecin the position indicated by dotted lines in trical circuitis complete through the bell. In- 1 Fig. 2. stead of making contact through the hour E represents the taco canrwheel, which is hand of a clock, we utilize the motion of the I formed on a sleeve fittingloosely over the ararbor of one of its quick-moving wheels by her of the hour-hand wheel, and is provided 0 caused to engage with a pawl on a spring intosuch a position that the pin Q will enter rock-shaft or arbor, when a pin projecting the notch c' in the cam-whcelEat the moment from the front of a longitudinallysliding the hom hand points to the time the alarm is sleeve enters a notch in the face of a cam- 5 set for. 95 wheel, thereby allowing a fiat steel spring to 1" represents the spring which causes the movethespringroek-shal't longitudinally, and rock-shaft to movelongitudinally when the so cause its pawl to engage with the ratchet 1 pin e enters the notch 6 against the resistwheel, so that a rotary motion will be im 1 ance of the spring 0, thus causing the pawl B parted t0 the said rock-shaft, which willcause l to engage'with the ratchetwheel A, which I00 a contact-piece on its end to complete an elec 5 then pushes back the armsbb, and so partially trical circuit through the bell. If preferred, i rotates the rock-shaft C, so causing the piece l l 40 securing thereon a ratchet-wheel, which is [with a hainhc, Fig. 2,wherebyit can be turned i l l D to contact with insulated spring D, thus completing the circuit through the bell. As the ratchet-wheel A continues to rotate, it will cause the pawl B to turn over into the position indicated by dotted lines in Fig.1, thus allowing the rock-shaft C and contact-- piece D to again return to their normal positions.

It is evident that the period of contact between the piece D and the spring D may readily be regulated by adjusting the said spring by means of the setscrew cl. If it is set nearer to the contact-piece D, then the bell will ring for a longer 'periodsay from five seconds upward and, vice versa, if the spring is set farther away, the duration of the contact, and therefore the ringing of the bell,wiil be shortened.

Having now particularly described and ascertained the nature of our invention and in what manner the same is to be performed,we declare that what we claim as our improvements in electrical alarm-clocks is 1. In an alarm-clock, the combination,with a make-and-break device interposed in an alarm-circuit and one of the quick-going arbors of the going train, of a shifting mechanism controlled by a slow-going arbor of the going train and connecting devices controlled by the shifting mechanism for connecting the make-and-break device with the quick-going arbor, substantially as and for the purposes specified.

2. In an alarm-clock, the combination, with a make-and-break device interposed in an alarm-circuit, one of the quick-going arbors of the going train, and a connection between one element of the m ake-and-break device and the quick-going arbor of the going train, consisting of alongitudinally-movable rock-shaft L on which such element is mounted, a pawl sei cured to said rock-shaft, and a ratchet-wheel on the quick-moving arbor, of a shifting mechanism controlled by a slow-going arbor of the going train and adapted to operate on the rock-shaft to move the pawl into and out of engagement with the ratchet, substantially as and for the purposes specified.

3. In an alarm-clock, the combination, with one of the quick-going arbors of the going train, a make-and-break device, and a ratchetand-pawl connection between the two, of shift ing mechanism adapted to move the pawl into and out of .ngagement with the ratchet and a controlling device operated by a slow-going arbor of the going train, consisting of a cam, and a connection between the cam and pawlshifting mechanism, substantially as and for the purposes specified.

4. In an alarm-clock, the combination, with. a quick-going arbor of a cloclcgoing train, a ratchet-wheel, A, secured thereto, the'hourhand arbor of said train, and the cam E mounted thereon, of the contact D, a longitudinally-movable rock-shaft for said contact, apawl carried on the rock-shaft and adapted to engage the ratchet on the quick-going arbor, and a shifting device connected with the rock-shaft and controlled by the cam on the hour-hand arbor to move the pawl into and out of engagement with the ratchet, substantially as and for the purposes specified.

5. In an alarm-clock, the combination, with a quick-going arbor of a clock-going train, a ratchet-wheel, A, secured thereto, a longitudinally-movable rock-shaft, O, the pawl B, and spring a mounted thereon, of the hourhand arbor, the cam E loose thereon and provided with a hand, 6, the sliding pin 6, and the spring F, said parts being arranged and operating substantially as and for the purposes specified.

SAMUEL KAHAN. ALBERT \VILLIAM CRAVEN.

\Vitnesses:

WILLIAM GUEST HOLDEN, EDWARD WATERs. 

